Glass-mold.



HEINRICH WILHELM HEERDT, OF AUSSIG, AUSTRIA-HUN GARY.

GLASS-MOLD.

SPECIFICATION forming part of Letters Patent NO. 656,189, dated August21, 1900. I I v Application filed March 2l, 1900. Serial No. 9,622. (Nomodel.)

1'0 all whom t may concern.:

Be it known that I, HEINRICH WILHELM IIEERDT, a citizen of the Empire ofAustria- Hungary, and a resident of Aussig, Austria- Hungary, (whosepost-office address is Prodlitzerstrasse No. 911, Aussig,) have inventedcertain new and useful Improvements in Glass-Mold s, of which thefollowing is a specification.

To produce 0'lass bottles with sides and bottoms of uniform thickness,such as are alone marketable, long experience on the part of theglass-blower is required. Still more difficult is it to achieve thiswhen manufacturing bottles by machinery, a practice which is continuallyextending. Before the ball or the lump of glass picked up with theblowpipe and blown and worked into pear shape is blown into the mold inwhich the bottle is formed it has by means of suitable manipulation andby the aid of the weight of its lower part to be given the length whichthe iinished bottle is to have. Accordingly the glass-maker does notblow until the ball has touched the bottom of the mold; but it is notpossible to wait until this moment to close the mold, as otherwise theball would have time to elongate too much. As it is not possible whenthe mold is closed to observe from the outside the moment when the ballhas extended to the whole length of the mold, it

is necessary that the moment in which this occurs should. be indicatedby some other means.

The present invention relates to an improved glass-mold in which thisobject is attained.

Figure 1 of the annexed drawings shows a vertical cut through the mold,the glass bulb having just been introduced, while Fig. 2 shows the samewith the ready-blown bottle.

In the annexed drawings the mold @has two bottoms, of which the lowerone b forms the foot of the mold, while the upper one ois movable andforms the actual bottom of the mold. The upper bottom o rests upon thelower one b by means of a spiral spring, and its position before theglass ball is introduced isas represented in Fig. 1. On the ball e,hanging to the pipe d', being introduced into the mold and the latter/being closed around the bottom the ball e will by its own weight, beforeair is blown, in elongate itself, so as to press down the bottom c andcompress the spiral spring f. If the spring f is of the correctstrength, the bottom o will descend slowly until it touches the bottomb. The position then is shown in Fig. 2, the dotted lines g indicatingthe shape of the ball at this stage of the process. In the lower bottomb is an insulated electrical contact h, and close to the bottom b in theside of the mold is another insulated electrical contact t'. In thedescent of the upper bottom o its part 7a touches the contact t', andwhen the bottom b has been reached the part Z of bottom c touches thecontact h and closes an electrical circuit, which operates an alarm-bellor such like, which indicates that the moment has arrived for blowing,or in the"case of glassblowing machines, for which the present apparatusis principally intended, the electrical current operates the valve ofthe compressedair pipe, and thus allows air to enter through pipe d andblow out the ball, forming the latter into a bottle. The air-valve isthen closed by hand or by any other means.

The arrangement by which the electrical current is switched on and bywhich the said current operates the compressed-air valve may take anydesired form, and various modiiications may be made in the arrangementof the contact between the upper and lower bottoms.

The employment of this improved mold is not restricted to themanufacture of bottles, since the apparatus is suitable for use in themanufacture of all kinds of hollow articles of glass.

1. The combination with a glass-mold of means for automatically closingan electric circuit by aid of the weight of the glass, substantially asshown and described.

2. The combination with a glass-mold of a spiral spring fastened on topof the bottom and a false bottom borne by said spring,electrically-insulated contacts being disposed in the wall and in thebottom, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

HEINRICH WILHELM HEERDT.

Witnesses:

BERTHOLD EISNER, ADoLPH FISCHER..

